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The only 'exposed cable' allowed is BX cable (or BXL) with the metal sheathing. And it must be fixed with cable straps at regular intervals. You can also run in rigid conduit as shown in the furnace picture.
Ian
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'87 Carrera Cab
----- “Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.” A. Einstein -----
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